Using KDE 4.3. If I run glxgears without compositing, I get ~17.4k FPS. When I enable compositing, glxgears stutters horribly, but says it goes at 5k FPS. Why is performance totally killed when compositing is enabled? I have an 896mb gtx260 which should be more than enough for this...here comes my xorg.conf if it makes any difference (also am using 190.36 drivers, but this issue has been with older drivers as well):